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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Interest expense	$ 173	$ 176	$ 526	$ 541
Interest income	1	2	3	6
Interest expense, net	$ 172	$ 174	$ 523	$ 535

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Amount of the cost of borrowed funds accounted for as interest expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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